这种气体是硫化氢，上升后与石灰岩裂缝中地下水的氧气混合。
This gas is hydrogen sulfide, rises up and mixes with oxygen in the underground water that sits in the cracks and fissures in the limestone.
如果没有排水系统，地下水位就会上升，把溶解的盐带到地表。
If no drainage system exists, the water table rises, bringing dissolved salts to the surface.
上升的海洋可能侵蚀海岸线，破坏地下水。
Rising seas threaten to erode the coastline and spoil thegroundwater.
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